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This CL adds calls to track when WebMediaPlayerMS is hidden or shown, so
that in the time period we can skip creating GMB backed frames. For that
time period, frames aren't going to be displayed, so copying them to GMBs
is extra work which should be avoided.

Bug: 653200
Change-Id: I67e55c7f1150b434d82321ac90a08c7c3e3e6336
Reviewed-on: https://chromium-review.googlesource.com/954339Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542950}